TAF2 by Hoya
Special
Very Rare
Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
| Refractive Index (nd) | 1.7945 |
|---|---|
| Abbe Number (Vd) | 45.39 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{3.14156 - 0.0143703\,\lambda^2 + 0.0264831\,\lambda^{-2} + 0.000956427\,\lambda^{-4} - 5.94111 \times 10^{-5}\,\lambda^{-6} + 4.70395 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.0 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.4 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.63294 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.35 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 1 |
| Acid Resistance | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Not in a position to accept new order because of discontinuation.
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| LAH67 | Ohara | 1.794997 | 45.293967 | |
| S-LAH67 | Ohara | 1.794997 | 45.293967 | |
| N-LAF32 | Schott | 1.79457 | 45.53 | |
| LASFN19 | Sumita | 1.795 | 45.2 | |
| E00-46 | Corning | 1.800001 | 45.608618 | |
| D-ZLAF50-25 | CDGM | 1.80225 | 45.452746 | |
| D-ZLAF50 | CDGM | 1.80337 | 45.491557 | |
| H-ZLAF1 | CDGM | 1.80166 | 44.263459 | |
| LASFN30 | Schott | 1.803181 | 46.379894 | |
| E03-47 | Corning | 1.803002 | 46.408629 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| M-TAF31 | Hoya | 1.80139 | 45.45 | |
| MC-TAF31-15 | Hoya | 1.80154 | 45.47 | |
| MP-TAF31-15 | Hoya | 1.80154 | 45.47 | |
| NBFD14 | Hoya | 1.801699 | 44.321602 | |
| TAF3 | Hoya | 1.8042 | 46.5 | |
| TAF3D | Hoya | 1.8042 | 46.5 | |
| NBFD11 | Hoya | 1.7859 | 43.94 | |
| TAF4 | Hoya | 1.788 | 47.49 | |
| NBFD1 | Hoya | 1.789004 | 42.757634 | |
| TAF48 | Hoya | 1.79091 | 48.09 |